What is a simple popup date picker for an ASP project?

I am doing an ASP project where the user enters information in a form and the information is sent to an Access database. On one of the form fields (example month), I want to include a simple popup calendar picker that will give me the same date format and then send the entry into the proper field in the Access database.

I have read a couple of previous entries on popup calendars on the knowledge base, but I am looking for a simple one, and ways to code it.

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For some reason, the Year, Month and Day do not enter into the database. I am attaching in the code field, the entire page. All the other fields in the database collect information, but not the Year, Month and Day fields.
Suggestions?

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I was asked about the differences between classic ASP and ASP.NET, so let me put them down here, for reference:
Let's make the introductions...
Classic ASP was launched by Microsoft in 1998 and dynamically generate web pages upon user interact…